Caster Semenya, who won gold at the World Championships in the 800m in London earlier this month for South Africa, set a new world record in the 600m on Sunday in Berlin.
Ajee Wilson, a New Jersey native and Neptune High graduate, placed second -- also besting the former world best -- and set a new American best in 1:22.39.
Both women surpassed Ana Fidelia Quirot's former world best of 1:22.63, which was set in 1997.
| Updated 600m World All-Time List | ||||
| Rank | Time | Athlete | Country | Date |
| 1 | 1:21.77 | Caster Semenya | RSA | 27.08.2017 |
| 2 | 1:22.39 | Ajee' Wilson | USA | 27.08.2017 |
| 3 | 1:22.63 | Ana Fidelia Quirot | CUB | 25.07.1997 |
| 4 | 1:22.87 | Maria Mutola | MOZ | 27.08.2002 |
| 5 | 1:23.18 | Francine Niyonsaba | BDI | 27.08.2017 |
| 6 | 1:23.35 | Pamela Jelimo | KEN | 05.07.2012 |
| 7 | 1:23.44i | Olga Kotlyarova | RUS | 01.02.2004 |
| 8 | 1:23.50 | Doina Melinte | ROU | 27.07.1986 |
| 9 | 1:23.59i | Alysia Montaño | USA | 16.02.2013 |
| 10 | 1:23.78 | Natalya Khrushchelyova | RUS | 02.09.2003 |
| 10 | 1:23.78 | Anita Weiß | GDR | 24.07.1976 |